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Your SaaS product lives and dies by its email. User onboarding, password resets, billing alerts, and team invitations all depend on reliable email delivery. These free tools help you verify authentication, monitor domain health, and ensure every notification reaches your users' inboxes.
SaaS products send more transactional email per user than almost any other business type. Welcome sequences, verification codes, usage alerts, invoice receipts, team invitations — each email is a critical touchpoint. A single delivery failure can break the user experience and trigger a support ticket or, worse, churn.
As your product scales, email complexity grows. Multiple sending services (transactional API, marketing ESP, support helpdesk), multiple domains and subdomains, and frequent infrastructure changes all create opportunities for authentication records to break. Without monitoring, these breaks happen silently.
Enterprise buyers evaluate your security posture before signing contracts. A missing DMARC policy, an expired SSL certificate, or a blacklisted IP address signals that you don't take infrastructure seriously. These are the kinds of findings that kill deals in security reviews.
On the deliverability side, Google and Yahoo now require DMARC, SPF, and DKIM for bulk senders. Even if your transactional email volume is modest, your marketing sends might push you into bulk sender territory. Proper authentication isn't optional — it's the baseline.
The tools SaaS engineering and DevOps teams use most — all free, no signup required.
Comprehensive email & DNS security report with health score
Check DMARC policy and configuration for a domain
Validate SPF records and email authentication setup
Validate DKIM records and email signing configuration
Query all DNS records for any domain
Find mail exchange servers for a domain
Verify SSL/TLS certificate details and expiration
Comprehensive security scan: SSL, headers, HTTPS redirects, and open ports
Verify each item using Email Armory's free tools.
Welcome emails, password resets, billing notifications, and team invites are the backbone of your product experience. If these emails don't arrive, users churn before they even get started.
SaaS companies often manage multiple domains — primary app, marketing site, support subdomain, staging environments. Each needs proper authentication records. Use Domain Health to audit them all.
Enterprise customers evaluate your email security posture during procurement. A proper DMARC policy, valid SSL, and clean blacklist status demonstrate that you take security seriously.
Switching email providers, DNS hosts, or adding new sending services requires careful DNS changes. Verify SPF includes, DKIM selectors, and MX records after every migration.
Browse all 17 free tools — DNS, email, and security — no signup required.
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